diff --git a/com/win32comext/axscript/src/GUIDS.CPP b/com/win32comext/axscript/src/GUIDS.cpp
similarity index 100%
rename from com/win32comext/axscript/src/GUIDS.CPP
rename to com/win32comext/axscript/src/GUIDS.cpp
diff --git a/isapi/src/pyISAPI.cpp b/isapi/src/pyISAPI.cpp
index 453cc2b99..6cf639351 100644
--- a/isapi/src/pyISAPI.cpp
+++ b/isapi/src/pyISAPI.cpp
@@ -23,7 +23,7 @@
  ======================================================================
  */
 
-// PYISAPI.CPP - Implementation file for your Internet Server
+// pyISAPI.cpp - Implementation file for your Internet Server
 //    Python ISAPI Extension
 
 #include "stdafx.h"
diff --git a/setup.py b/setup.py
index ce0120e24..ddb0eb447 100644
--- a/setup.py
+++ b/setup.py
@@ -930,13 +930,6 @@ def my_new_compiler(**kw):
 
 
 class my_compiler(MSVCCompiler):
-    # Just one GUIDS.CPP and it gives trouble on mainwin too. Maybe I
-    # should just rename the file, but a case-only rename is likely to be
-    # worse!  This can probably go away once we kill the VS project files
-    # though, as we can just specify the lowercase name in the module def.
-    _cpp_extensions = MSVCCompiler._cpp_extensions + [".CPP"]
-    src_extensions = MSVCCompiler.src_extensions + [".CPP"]
-
     def link(
         self,
         target_desc,
@@ -1439,7 +1432,7 @@ def finalize_options(self):
         sources=(
             """
                         {axscript}/AXScript.cpp
-                        {axscript}/GUIDS.CPP                   {axscript}/PyGActiveScript.cpp
+                        {axscript}/GUIDS.cpp                   {axscript}/PyGActiveScript.cpp
                         {axscript}/PyGActiveScriptError.cpp    {axscript}/PyGActiveScriptParse.cpp
                         {axscript}/PyGActiveScriptSite.cpp     {axscript}/PyGObjectSafety.cpp
                         {axscript}/PyIActiveScript.cpp         {axscript}/PyIActiveScriptError.cpp